NOISE SUPPRESSING APPARATUS, SPEECH RECOGNITION APPARATUS, AND NOISE SUPPRESSING METHOD
First Claim
1. A noise suppressing apparatus that suppresses noise included in a sound signal, the noise suppressing apparatus comprising:
- a memory; and
a processor configured to be connected to the memory and to perform processing of suppressing the noise included in the sound signal, whereinthe processing of suppressing the noise includes;
calculating a phase difference on the basis of frequency spectra of a first sound signal and a second sound signal obtained by picking up a pickup target sound using a microphone array;
calculating a first sound arrival rate on the basis of a first phase difference area and the phase difference and calculating a second sound arrival rate on the basis of a second phase difference area and the phase difference, wherein the first phase difference area is set on the basis of a direction of arrival of the pickup target sound which arrives at the microphone array, and the second phase difference area is different from the first phase difference area;
calculating a dissimilarity that represents a level of difference between the first sound arrival rate and the second sound arrival rate;
determining whether the pickup target sound is included in the first sound signal on the basis of the dissimilarity; and
determining a suppression coefficient to be applied to the frequency spectrum with respect to the first sound signal, on the basis of a result of the determination of whether the pickup target sound is included and on the basis of the phase difference.
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Accused Products
Abstract
A noise suppressing apparatus calculates a phase difference on the basis of a first and second sound signal obtained by a microphone array; calculates a first sound arrival rate on the basis of a first phase difference area and the phase difference and a second sound arrival rate on the basis of a second phase difference area and the phase difference; calculates a dissimilarity that represents a level of difference between the first sound arrival rate and the second sound arrival rate; determines whether the pickup target sound is included in the first sound signal on the basis of the dissimilarity; and determines a suppression coefficient to be applied to the frequency spectrum of the first sound signal, on the basis of a result of the determination of whether the pickup target sound is included and on the basis of the phase difference.
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Citations
12 Claims
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1. A noise suppressing apparatus that suppresses noise included in a sound signal, the noise suppressing apparatus comprising:
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a memory; and a processor configured to be connected to the memory and to perform processing of suppressing the noise included in the sound signal, wherein the processing of suppressing the noise includes; calculating a phase difference on the basis of frequency spectra of a first sound signal and a second sound signal obtained by picking up a pickup target sound using a microphone array; calculating a first sound arrival rate on the basis of a first phase difference area and the phase difference and calculating a second sound arrival rate on the basis of a second phase difference area and the phase difference, wherein the first phase difference area is set on the basis of a direction of arrival of the pickup target sound which arrives at the microphone array, and the second phase difference area is different from the first phase difference area; calculating a dissimilarity that represents a level of difference between the first sound arrival rate and the second sound arrival rate; determining whether the pickup target sound is included in the first sound signal on the basis of the dissimilarity; and determining a suppression coefficient to be applied to the frequency spectrum with respect to the first sound signal, on the basis of a result of the determination of whether the pickup target sound is included and on the basis of the phase difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A speech recognition apparatus that suppresses noise included in a sound signal and performs speech recognition processing on a sound signal in which the noise has been suppressed, the speech recognition apparatus comprising:
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a memory; and a processor configured to be connected to the memory and to perform processing of suppressing the noise included in the sound signal, wherein the processing of suppressing the noise includes; calculating a phase difference on the basis of frequency spectra of a first sound signal and a second sound signal obtained by picking up a pickup target sound using a microphone array; calculating a first sound arrival rate on the basis of a first phase difference area and the phase difference and calculating a second sound arrival rate on the basis of a second phase difference area and the phase difference, wherein the first phase difference area is set on the basis of a direction of arrival of the pickup target sound which arrives at the microphone array, and the second phase difference area is different from the first phase difference area; calculating a dissimilarity that represents a level of difference between the first sound arrival rate and the second sound arrival rate; determining whether the pickup target sound is included in the first sound signal on the basis of the dissimilarity; determining a suppression coefficient to be applied to the frequency spectrum with respect to the first sound signal, on the basis of a result of the determination of whether the pickup target sound is included and on the basis of the phase difference; applying the determined suppression coefficient to the frequency spectrum; and transforming the frequency spectrum to which the suppression coefficient has been applied into a sound signal.
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12. A noise suppressing method for suppressing noise included in a sound signal, the noise suppressing method comprising:
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calculating, by a computer, a phase difference on the basis of frequency spectra of a first sound signal and a second sound signal obtained by picking up a pickup target sound using a microphone array; calculating, by the computer, a first sound arrival rate on the basis of a first phase difference area and the phase difference and calculating, by the computer, a second sound arrival rate on the basis of a second phase difference area and the phase difference, wherein the first phase difference area is set on the basis of a direction of arrival of the pickup target sound which arrives at the microphone array, and the second phase difference area is different from the first phase difference area; calculating, by the computer, a dissimilarity that represents a level of difference between the first sound arrival rate and the second sound arrival rate; determining, by the computer, whether the pickup target sound is included in the first sound signal on the basis of the dissimilarity; and determining, by the computer, a suppression coefficient to be applied to the frequency spectrum with respect to the first sound signal, on the basis of a result of the determination of whether the pickup target sound is included and on the basis of the phase difference.
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Specification